Valens
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Valens was Roman emperor from 364 to 378. Following a largely unremarkable military career, he was named co-emperor by his elder brother Valentinian I, who gave him the eastern half of the Roman Empire to rule. In 378, Valens was defeated and killed at the Battle of Adrianople against the invading Goths, which astonished contemporaries and marked the beginning of barbarian encroachment into Roman territory.
A solidus of Valens with a pearl diadem and a roseate fibula
Reverse of a solidus of Valens, marked: restitutor reipublicae ("the restitutor of the Republic") and showing the emperor holding a vexillum and a globe supporting a Victory, who crowns him with a laurel wreath
Coin of Valens after his quinquennalia on 25 February 369, showing the three reigning emperors on the reverse marked: spes r p ("the hope of the Republic")
Gratian
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Gratian was emperor of the Western Roman Empire from 367 to 383. The eldest son of Valentinian I, Gratian was raised to the rank of Augustus as a child and inherited the West after his father's death in 375. He nominally shared the government with his infant half-brother Valentinian II, who was also acclaimed emperor in Pannonia on Valentinian's death. The East was ruled by his uncle Valens, who was later succeeded by Theodosius I.
Solidus of Valentinian I showing Valentinian and Gratian on the reverse, marked: victores augusti ("the Victors Augusti"). A palm bough is between them and Victory crowns each with a wreath
Solidus of Gratian
Marble portrait head of Gratian (Rheinisches Landesmuseum Trier)